Fluid catch rotary jar



7 Jan. 29, 1935.

J. A. KAMMERDINE R FLUID CATCH ROTARY JAR Filed Oct. 29, 1952 3 5 UPI/ha 1 Patented Jan. 29, 1935 I 4 1,989,280

UNITED STATES PATE NT QF CE James AllenKammerdiner, Los Angeles, Calif. v

Application October 29, 1932, Serial No. 640,140

' 6 Claims. (Cl. 255- 27) This invention relates to a jar for producing an et of a tool joint forming a part of a drill string. pa ow i a String o p n tubing, rods, or The other end of shell 6 is threaded to receive the like, wherein a longitudinal stress is exerted a hammer nut 8 having a square bore. Head '7 upon the string. A specific application of the has a stuffing box 9 to accommodate a wash pipe invention is its use in loosening tools, fishing on the mandrel. Extending into the head 7 are in well holes for lost parts, tools, or equipment plun b els 10 having ports 11 communicatcalled fish which have become lodged or froing with the ex ri r f th head- The ports e zen in the hole. In such instances, a grip is obc ntrolled y a l checks 12 p tt fr r ss tamed-upon the fish by means of a, uitabl fishof fluid from the barrels and preventing ingress.

, ing tool disposed at the end of a string and jar- Bleeder ducts 3 a 'n i in head 7 n ing is resorted to in order to dislodge the fi h, ting slow entrance of fluid to the barrels. Slid- The string of pipe used in well drilling for tools a mounted Within the Shell 6 is the mandrel has elasticity, such that if the jar is placed at ha a head 14 forming'an anvil coalition the bottom of thestring, an upward pull exerted with hammer 8. The head 14 has lon i in l and the jar tripped, an impact of great magni recesses 15 to allow play of liquid in the shell tude is obtained. There are other conditions in abOVe and below the head and T 5 prevent mwhich a downward drive is desirable, such as in D fi e t IBOiPIOCatiOIL A Square Stem 16 splitting pipe, perforating casings, d ib ttends from the head and through the bore of nut ing casing to determine frozen locations. In such 8, there being r ss s to a the movement instances, the jar may be tripped by an accumulaof the mandrel. Extending through the mandrel 29 tion of the load on the drill string, the position ise hotel8 internellythreaded at the upper end of the catch elements being reversed in relation to receive a Wash P 19 Serving as ti ueto that wherein a pull on the string is exerted for tion of the passage through the mandreland djarring. 1 ably mounted in the head '7. The lower end of 3 The primary object of th present invention stem 16 is provided witha tapered threaded pin is to provide a jar, the impact parts of'which are 20 arranged to be connected to a tool joint. Se-

held in set position by a fluid catch, and which cured t0 the anvil head 14 are pluhgers 21 p e may be tripped by sustaining a longitudinal stress Slide into d out of the barrels I I 7 upon the .jar A r specific je t ofthj g It will be noted that the jar sections are held ti n [is to provide a jar of the character against rotation in relation toone another sothat scribedwhichis-held in set-positioh by t thedrill string of which the jar forms apart sistance of the movement of a plunger or the like may be d to tat a y t l attach d to t snugly fittin i a li d or barrel, t jar lower end. The jar sections may have a limited ing released by withdrawing theplunger from longitudinal movement being arrested at one end 6 itsbarrel. The plunger is restrained to an iniby engagement of the hammer 3 with anvil 14 and tial slow movement creating a partial Vacuum in t d at t other end b engagement O anvil the barrel which is broken on the plunger r d 14 with head 7. In the latter position, plungers 21 out of its barrel and being suddenly released, thus wi be disposed Within barrels hhtrence of I the plungers intothe barrels is comparatively free,

tripping the jar.

These objects together with other objects and a y pp d liquid passing out of the barrels 9 corresponding accomplishments are obtained by t roug bl ede ducts 13 and Ports 11, Valves 12 means of the embodiment of my invention illusopenin permit egress w Withdrawal tratedjn the accompanying drawing, in which; of the plungers is checked by the closure of valves Fig. 1 is an axial section through a jar in set 12 andfluid can only bleed slowly into the barrels position; Figs. 2,3, and 4 are sections as seen t ough Chi 3- e ja is p a ed in a String 4 on the lines correspondingly numbered in Fig. 1; of tubing, the pipe 19 and passagel'l permitting and Fig. 5 is a fragmentary sectional view on an circulation to be maintained through the string. enlarged scale of a modified form of the jar. The jar is set by lowering the drill string and Referring more particularly to Fig. 1, the jar thereby moving the anvil head 14 toward head 7 9 comprises two sections, a bowl A and a mandrel so that plungers 21 fully enter the plunger barrels B telescopically related and having a catch incli- 10. This contracts or sets the jar, the plungers cated by C to hold the sections in set position. beingtrapped and yieldably holding the jar sec- The bowl includes a tubular shell 6 threaded tions in contracted position. A grip having been to, receive a head 7 provided with 'a tapered obtained on the fish, a pull isexerted upon the threaded pin adapted to be received in the sock- .drill string. This tends to cause the jar to ex- 55 pand. The plungers 21 tend to move out of their respective barrels, but due to the smallness of ducts 13 and the tightness of the fits of the plungers in their barrels, a partial vacuum will be created and fluid can only enter the barrels slowly, thereby checking withdrawal and tripping of the jar. Fluid bleeding into the plunger chambers through the leak ducts permits slow movement of the hammer 8 toward the anvil 14. Elasticity of the drill string permits the latter to stretch and store energy for an impact blow. When the plungers override the lower ends of the plunger barrels, the mandrel is released and the hammer 8 strikes the anvil 14 with an impact of such violence that it either dislodges or aids in dislodging the fish.

In Fig. 5, the parts shown for the bowl are the same as in Fig. 1 except that leak or bleeder ducts 13 in head 7 are omitted. The like parts are correspondingly numbered. To replace ducts 13, the plungers 21 are provided with longitudinally extending ducts 22 opening at the outer ends of the plungers and at the roots opening laterally by way of side branches 23. The head '7 is dished slightly so that branches 23 are open to the liquid within the bowl when the plungers are fully inserted. The operation is obvious, ducts 22 enabling liquid to bleed into the plunger barrels.

What I claim is:

1. In a rotary jar, a barrel member comprising an elongated hollow shell'of substantial internal diameter, a mandrel member projecting into said shell and mounted for reciprocating movement within said shell, said two members having cooperating impact faces which abut against each other in response to, and limit, outward movement of said mandrel member from said barrel member, one of said members deflninga suction cylinder closed at *one end and mergingat the other end into the space within said shell, the other of said members comprising a piston aligned with and fitted to said suction cylinder and so dimensioned and positioned longitudinally that it penetratessaid suction cylinder when said members are in closed position and leaves the suction cylinder during opening movement prior to contact of said impact faces, the cross sectional area of the space within said shell being at least several times as great as the cross sectional area of said suction cylinder, whereby resistance to opening'movement of said members resulting from fluid friction about said piston is negligible after said piston leaves said suction chamber.

2. In a rotary jar, a barrel member comprising an elongated hollow shell of substantial internal diameter, a mandrel member projecting into said shell and mounted for reciprocating movement within said shell, said two members having cooperating impact faces which abut against each other and limit outward movement of said mandrel member from said barrel member, one of said members defining a plurality of suction cylinders positioned alongside each other, said cylinders each being closed at one end and merging at the other end into the space within said shell, theother of said members comprising a plurality of pistons aligned with and fitted to said respec-. tive suction cylinders and so dimensioned and positioned longitudinally that they penetrate said suction cylinders when said members are in closed position and leave the suction cylinders during opening movement prior to contact of said impact faces.

3. In a rotary jar, a barrel member comprising an elongated hollow shell of substantial internal diameter, a mandrel member projecting into said shell and mounted for reciprocating movement within said shell, said two members having cooperating impact faces which abut against each other and limit outward movement of said mandrel member from said barrel member, one of said members defining a plurality of suction cylinders positioned alongside each other, said cylinders each being closed at one end and merging at the other end into'the'spac'e within said shell, the other of said memberscomp'rising a plurality of pistons aligned with and fitted to said respective suction cylinders and so dimensioned and positioned longitudinally that they penetrate said suction cylinders when said members are in closed position and leave the suction cylinders during opening movement prior to contact of said impact faces, the total cross sectional area of the pistons being less than the cross sectional area of the space surrounding said pistons within said shell when said pistons are retracted from said suction cylinders.

4. In a rotary jar, a barrel member comprising an elongated hollow shell of substantial internal diameter closed at the upper end bya longitudinally thick end wall,.the latter containing and defining a suction cylinder,-the inner end of which opens into the interior of said shell, the opposite end of said shell having a flange extending radially inwardly, the inner end of which flange constitutes an impact face, a mandrel member extending into said'shell through the flanged end thereof, having a shaft portion slidablyengaging said flange and guided by the inner wall of said shell, the outerside of said head portion constituting animpact face adapted to contact said impact face on said flange when the mandrel member is in outermost position with respect to said barrel member, said head having at its inner enda projecting piston aligned with and dimensioned to seal in said suction cylinder, whereby it enters the cylinder when the mandrel member isin'innermost position with respect to the barrel member, the depth of entry of said piston into said cylinder being substantially less than the'total relative travel between said members. i

5. In a-rotary jar, a barrel" member compris ing an elongated hollow shell of substantial internal'diameter closed at one end by a longitudinally thick end wall, the latter'containing and defining a plurality of suctions cylinders, the inner ends of which open into the interior of said shell, the opposite end of said shell having a flange extending radially inwardly, the inner annular face of said flange constituting animpact face, a mandrel member extending in said shell through the flanged end thereof, having a shaft portion slidably engaging said flange and guided thereby and a head portion of larger dimensions slidably engaging and guided by the inner wall ofsaid shell, the outer, annular face of said head portion constituting an impact face adapted to contact said impact face of said 6. A rotary jar as defined in claim 5 in which said mandrel member has a fluid passage extending therethrough with a pipe axially positioned on the inner end of said mandrel member, said 5 pipe connecting with said passage in said mandrel member and extending through a packing tons being symmetrically positioned about the longitudinal axis of said members.

JAMES ALLEN KAMMERDINER. 

